/*
 * Copyright (C) 2007-2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.zlibrary.text.hyphenation;

import org.geometerplus.zlibrary.core.util.ZLArrayUtils;
import org.geometerplus.zlibrary.core.xml.ZLStringMap;
import org.geometerplus.zlibrary.core.xml.ZLXMLReaderAdapter;

final class ZLTextHyphenationReader extends ZLXMLReaderAdapter {
    private static final String PATTERN = "pattern";

    private final ZLTextTeXHyphenator myHyphenator;
    private boolean myReadPattern;
    private char[] myBuffer = new char[10];
    private int myBufferLength;

    ZLTextHyphenationReader(ZLTextTeXHyphenator hyphenator) {
        myHyphenator = hyphenator;
    }

    public boolean startElementHandler(String tag, ZLStringMap attributes) {
        if (PATTERN.equals(tag)) {
            myReadPattern = true;
        }
        return false;
    }

    public boolean endElementHandler(String tag) {
        if (PATTERN.equals(tag)) {
            myReadPattern = false;
            final int len = myBufferLength;
            if (len != 0) {
                myHyphenator.addPattern(new ZLTextTeXHyphenationPattern(myBuffer, 0, len, true));
            }
            myBufferLength = 0;
        }
        return false;
    }

    public void characterDataHandler(char[] ch, int start, int length) {
        if (myReadPattern) {
            char[] buffer = myBuffer;
            final int oldLen = myBufferLength;
            final int newLen = oldLen + length;
            if (newLen > buffer.length) {
                buffer = ZLArrayUtils.createCopy(buffer, oldLen, newLen + 10);
                myBuffer = buffer;
            }
            System.arraycopy(ch, start, buffer, oldLen, length);
            myBufferLength = newLen;
        }
    }
}
